Okay to start this is my workflow & equipment for waterfalls and some landscape

Equipment
Nikon D70 Digital SLR with 18-70mm DX lens
Sturdy tripod (I'd recommend Manfrotto 190ProB or Velbon Ultra Luxi SF) capable of going quite low to the ground for adding good foreground - rule of thirds!
Flash for the late evening or early morning session
Circular polarisor set in accordance with suns rays (learn to use one properly)
ND filters (I use ND8 to allow 3 stops when there's too much light)
Waterproof footwear (I always get into the stream or river for the best/unusual shot/angle)
2GB memory card x 2 plus smaller spares you need to shoot plenty to get a perfect shot
Shower or waterproof camera bag I use the Lowepro slingshot 100AW
Time - don't rush take all day if you have to it's worth it ask any pro how long they can take to get the perfect shot
Location - search for the locations near you to experiment then go from there

Camera Setup
I always use manual mode set to F9, or F11 with a shutter between 0.5 secs to whatever the light tells you but i have gone as long as 13 secs!
Most shots in midday or normal light make sure you keep the sky out of the picture to avoid blown highlights and shoot at varying shutter speeds to get the water movement.
I always shoot RAW so I can adjust white balance and exposure at home if need be.
Colour space in camera sRGB
Remote control when shooting so I don't have to use the button on the camera.
Photoshop CS2/Capture one/ or try the free RAW Therapee for post process.

Post process
Crop!!! Very important the crop can turn an ordinary image into a stunning image
Adjust the exposure, white balance, levels to your liking and experiment - that's why RAW is so good compared to JPEG when shooting landscape images
Resize to either a print quality, storage quality or web quality depending what you want to do with the image
I then add slight saturation followed by a special action I created to add a very slight & soft blur & overlay
Add a very simple border of 10 pixel white & 100 pixel black or the reverse, and test if need be and you're done

I hope this helps but it works for me & I'm very happy with the results,